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Cheap flights from Portland, Maine to London from $326

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to London departing on 8/23. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Portland, Maine to London

Cheap round-trip flights

Enter your travel dates to find the best prices.
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 12:10 am
LHR
-
PWM
20h 55m
1 stop
$792JetBlue
Sun, Sep 6 - Tue, Sep 8
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 11:54 pm
LHR
-
PWM
20h 39m
1 stop
$803JetBlue
Wed, Sep 23 - Wed, Sep 30
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 11:52 pm
LHR
-
PWM
20h 37m
1 stop
$805JetBlue
Thu, Sep 17 - Tue, Sep 22
JetBlue Logo
2:40 pm - 8:45 pm
PWM
-
LHR
25h 05m
1 stop
JetBlue Logo
8:15 am - 12:25 am
LHR
-
PWM
21h 10m
1 stop
$823JetBlue
Sat, Aug 22 - Sat, Aug 29
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
11:55 am - 12:25 am
LHR
-
PWM
17h 30m
1 stop
$825JetBlue
Thu, Aug 13 - Thu, Aug 27
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 11:54 pm
LHR
-
PWM
20h 39m
1 stop
$845JetBlue
Tue, Sep 15 - Sat, Sep 19
Multiple Airlines Logo
6:00 am - 7:10 am
PWM
-
LHR
21h 10m
2 stops
Multiple Airlines Logo
7:25 am - 11:43 pm
LHR
-
PWM
20h 18m
1 stop
$849Multiple Airlines
Sun, Oct 25 - Fri, Oct 30
JetBlue Logo
6:00 am - 8:45 pm
PWM
-
LHR
9h 45m
1 stop
JetBlue Logo
8:15 am - 12:25 am
LHR
-
PWM
21h 10m
1 stop
$855JetBlue
Fri, Aug 28 - Sun, Aug 30
JetBlue Logo
2:40 pm - 9:30 am
PWM
-
LHR
13h 50m
1 stop
JetBlue Logo
8:15 am - 12:25 am
LHR
-
PWM
21h 10m
1 stop
$856JetBlue
Sat, Aug 22 - Sat, Aug 29
Virgin Atlantic Logo
6:01 am - 7:50 am
PWM
-
LHR
20h 49m
1 stop
Virgin Atlantic Logo
8:40 am - 11:33 pm
LHR
-
PWM
19h 53m
2 stops
$863Virgin Atlantic
Tue, Nov 3 - Thu, Nov 12

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JetBlue flights from Portland, Maine to London Heathrow Airport

Our best JetBlue deals on Portland, Maine to London Heathrow Airport flight tickets
JetBlue
Sep 6
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
Sep 8
LHR8:15 amLondon Heathrow
20h 55m
1 stop
PWM12:10 amPortland
$792
JetBlue
Sep 23
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
Sep 30
LHR8:15 amLondon Heathrow
20h 39m
1 stop
PWM11:54 pmPortland
$803
JetBlue
Sep 17
PWM6:00 amPortland
9h 45m
1 stop
LHR8:45 pmLondon Heathrow
Sep 22
LHR8:15 amLondon Heathrow
20h 37m
1 stop
PWM11:52 pmPortland
$805

Virgin Atlantic flights from Portland, Maine to London Heathrow Airport

Our best Virgin Atlantic deals on Portland, Maine to London Heathrow Airport flight tickets
Virgin Atlantic
Nov 3
PWM6:01 amPortland
20h 49m
1 stop
LHR7:50 amLondon Heathrow
Nov 12
LHR8:40 amLondon Heathrow
19h 53m
2 stops
PWM11:33 pmPortland
$863
Virgin Atlantic
Nov 3
PWM6:01 amPortland
20h 54m
2 stops
LHR7:55 amLondon Heathrow
Nov 12
LHR8:40 amLondon Heathrow
19h 53m
2 stops
PWM11:33 pmPortland
$867
Virgin Atlantic
Nov 3
PWM6:01 amPortland
19h 24m
1 stop
LHR6:25 amLondon Heathrow
Nov 12
LHR10:50 amLondon Heathrow
17h 43m
1 stop
PWM11:33 pmPortland
$892

momondo Fare Finder

 
Customize your flight search to find flights from Portland, Maine to London Heathrow Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated July 27, 2026.
Use the filters below to find and compare flights from Portland, Maine to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 9/6

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Tue 9/8

8:15 am-12:10 am

1 stop20h 55m

$792

PortlandLondon

PWM - LHR

PWMLHR

Portland

Wed 9/23

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Wed 9/30

8:15 am-11:54 pm

1 stop20h 39m

$803

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 9/17

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Tue 9/22

8:15 am-11:52 pm

1 stop20h 37m

$805

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 8/22

2:40 pm-8:45 pm

1 stop25h 05m

London Heathrow

Sat 8/29

8:15 am-12:25 am

1 stop21h 10m

$823
Quickest round-trip

PortlandLondon

PWM - LHR

PWMLHR

Portland

Thu 8/13

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Thu 8/27

11:55 am-12:25 am

1 stop17h 30m

$825

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 9/15

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Sat 9/19

8:15 am-11:54 pm

1 stop20h 39m

$845

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sun 10/25

6:00 am-7:10 am

2 stops21h 10m

London Heathrow

Fri 10/30

7:25 am-11:43 pm

1 stop20h 18m

$849

PortlandLondon

PWM - LHR

PWMLHR

Portland

Fri 8/28

6:00 am-8:45 pm

1 stop9h 45m

London Heathrow

Sun 8/30

8:15 am-12:25 am

1 stop21h 10m

$855

PortlandLondon

PWM - LHR

PWMLHR

Portland

Sat 8/22

2:40 pm-9:30 am

1 stop13h 50m

London Heathrow

Sat 8/29

8:15 am-12:25 am

1 stop21h 10m

$856

PortlandLondon

PWM - LHR

PWMLHR

Portland

Tue 11/3

6:01 am-7:50 am

1 stop20h 49m

London Heathrow

Thu 11/12

8:40 am-11:33 pm

2 stops19h 53m

$863

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to London from

How to get the cheapest flight ticket from Portland, Maine to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to London Heathrow Airport?

The month of December is, on average, the cheapest month to fly to London Heathrow Airport from Portland, Maine, with most prices found around $0. If you’re not able to fly to London Heathrow Airport in December, then January is your next best option. Flight prices from Portland, Maine to London Heathrow Airport during January average around $0.

When to book flights from Portland, Maine to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Portland, Maine to London Heathrow Airport (PWM to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to London Heathrow Airport

Fastest flight time

9h 10m

Direct flights

None
The fastest flight from Portland, Maine to London Heathrow Airport takes 9h 10m
There are no direct flights from Portland, Maine to London Heathrow Airport. There are no popular flight routes from Portland, Maine to London Heathrow Airport.
Search flight deals

Frequently asked questions about flying from Portland, Maine to London Heathrow Airport

  • How far is Portland to London Heathrow by plane?

    The distance between Portland and London Heathrow is about 3170.3 mi. In terms of flight time, this usually takes a little over 9h 10m.

  • When did momondo last update prices for flights from Portland Airport to London Heathrow Airport?

    Prices for flights from Portland Airport to London Heathrow Airport refresh daily.

  • How many operators does momondo search for flights from Portland Airport to London Heathrow Airport?

  • How old do you have to be to fly from Portland Airport to London Heathrow Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London Heathrow Airport.

  • What documentation or ID do you need to fly to London Heathrow Airport?

    The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from Portland, Maine to London Heathrow Airport?

Best airlines flying from Portland, Maine to London Heathrow Airport

Compare and see reviews for airlines that fly from Portland, Maine to London Heathrow Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $752Free CancellationRating
7.4
10,041 reviews
Search United Airlines flights

Traveling to a place near London?

Book flights to London if you plan to visit one of these locations
Hounslow
Gatwick
Milton Keynes
Luton
Hayes
Dover
Crawley
Wembley
Croydon
Stansted
Stratford-upon-Avon
Kingston upon Thames
Watford
Slough
Harrow
Brentwood
Cobham
Romford
Uxbridge
Guildford

Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Portland.

Can I find flights from Portland to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from Portland with this policy.

How can momondo help me find flights from Portland to London?

Once you have performed a search for Portland to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Portland and alert you when they change.

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